Thin-gauge 1180MPa-grade dual-phase steel and processing method thereof

Abstract

The invention discloses thin-gauge 1180MPa-grade dual-phase steel and a processing method thereof, and belongs to the technical field of steel rolling. The dual-phase steel comprises the following components in percentage by mass: 0.19%-0.23% of C, 0.10%-0.50% of Si, 0.60%-1.00% of Mn, not greater than 0.015% of P, not greater than 0.004% of S, 0.30%-0.70% of Cr, 0.020%-0.060% of Als, and the balance Fe and inevitable impurities. The dual-phase steel is produced through a continuous casting and rolling process for a sheet billet, and the processing method comprises the processes of smelting, refining, continuous casting and rolling for a sheet billet, cooling, coiling and leveling; and batch stable manufacturing for the thin-gauge 1180MPa-grade dual-phase steel with a thickness of 1.0-3.0mm is finally achieved, the production cost is lowered, and moreover, excellent comprehensive mechanical property is achieved, and the thin-gauge 1180MPa-grade dual-phase steel is capable of replacingcold-rolled dual-phase steel for manufacturing a vehicle body structural member of a passenger vehicle.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a thin-gauge 1180MPa dual-phase steel and a processing method thereof. Background technique [0002] In recent years, my country's automobile industry has continued to develop at a high speed, which has had a huge impact on social energy supply and environmental protection. In order to cope with the pressure of environmental protection, the state has promulgated a series of programmatic documents, clearly pointing out that my country's manufacturing industry should accelerate the pace of transformation of green manufacturing and ecological development. Existing research shows that lightweight is the most effective measure to achieve energy saving and emission reduction of automobiles, and high strengthening of steel materials is an important technical path to realize lightweight automobiles. Greening and high performance have become the development trend of steel materials...

AI Technical Summary

Problems solved by technology

[0003] Traditional advanced high-strength steel for automobiles, especially advanced high-strength steel with a thickness of less than 1.5mm, adopts a hot-rolled + cold-rolled manufacturing process, which has a long manufacturing process, complicated procedures, and high energy consumption. challenge

At present, most of the 1180MPa dual-phase steels used in automobile body structures are cold-rolled or cold-rolled hot-dip galvanized products. From the perspective of composition, most of them contain precious alloying elements such as Mo, Nb, and Ti, and the alloy cost is relatively high; In terms of technology, the production process consumes a lot of energy and costs high

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